Defensive publication



p yer? a 5 DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. Identification is by serial number of the application and the heading indicates the number of pages of specification, including claims, and of sheets of drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may he purchased for '30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED MARCH 25, 1969 SENSITIZERS FOR FINE GRAIN PHOTOGRAPHIC SILVER HALIDE EMULSIONS, e.g., A LIPP- MANN TYPE EMULSION Norman W. Kalenda, Kodak Park Works, Rochester, NY. 14650 Filed Oct. 18, 1968. Published Mar. 25, 1969 Class 96-107 No Drawing. 9 Pages Specification Certain sulfonic acid and carboxylated derivatives of 'bis- (triazinylamiuo)stilbene, p terphenyl, dibenzothiophene dioXide and chrysene such as bis(5-triazin-2-ylamino)-stilbene-2,2'-disulfonic acid (sodium salt); 4,4"-ibis (2,4 dimethoxy 5 sulfobenzamido) p terphenyl, triethanol-amine salt; 4,4'-bis[2-phenoxy-4-(Z-hydroxyethylamino) 1,3,5 triazin 6 ylamino] stilbene 2,2 disulfonic acid, sodium salt; chrysenesodium sulfonate; 4,4"- bis(4 sulfophenoxyacetamido) p terphenyl, triethanolamine salt; 3 ,7-bis (Z-naphthoylamido)-2,8-disulf0dibenzo thiophene-5,5-dioxide, sodium salt; 3,7-bis(1,3-dicarboxypropylurylene)dibenzothiophene dioxide, sodium salt; 4,4- bis[2,4 di(2 hydroxyethylamino) 1,3,5 triazin 6- ylamino]-sti1bene-2,2'-disulfonic acid, sodium salt are effective sensitizers for increasing sensitivity of fine grain photographic silver halide emulsions, e.g., a Lippmann type emulsion. These compounds, for example, are useful in chemically sensitizing unfinished, fine grain, photographic silver halide emulsions. 

